Originally Posted by IL_Pete

I saw your exhaust video this morning on Instagram (and then later here). It sounded GREAT! I really need to get a camera and mic setup for these exhaust comparisons.

Originally Posted by dmboone25

Do you happen to have a link? I don’t have an account.

Originally Posted by IL_Pete

I took my B25 out on a track on Friday. After I came in I chatted with a guy who asked if that was me in the Boxster. He said "Holy cow, that sounded AMAZING!", and asked me what I had on there for an exhaust.

That was nice to hear. With the long gearing of the 718 4.0, I was often too long in 3rd for the tighter bits, so I often did 2nd at some ballistic RPMs. I sounded pretty amazing inside the car too, top up and windows down. Even with a helmet on, it sounded pretty killer.

Fun times!

Originally Posted by IL_Pete

Correct on the current setup. The current setup is great! To clarify, I have a GT4 coming in August - So I was planning to get another exhaust for that anyway, and given the hardtop and being more susceptible to the bassiness the troublesome RPMs, I was thinking of the Kline. I decided to get it early and try it on the Boxster 25 first. If not for the GT4 coming, I probably wouldn't have ordered the Kline.

If I put the Kline on the Boxster and really love it, then I will really be causing myself problems, I would have to buy a second one! LOL, first world problems.

I plan to overlap the GT4 and Boxster, and consider keeping both for a while, or selling one of them. I switched my GT4 order at the last minute from a Manual to a PDK. I wanted to check out the PDK, but at the same time I am a die-hard Manual fan, so I may have set myself up to either keep both or keep the B25 and sometime later sell the GT4, but likely not keep the GT4 over the Boxster, which might have happened if I stuck with the Manual in the GT4. I plan to do more track time, so I thought the GT4 with a PDK would be fun for the track. If I dig it for that, I may try to justify keeping both, at least until I see what 2023 brings for allocations.

I saw your exhaust video this morning on Instagram (and then later here). It sounded GREAT! I really need to get a camera and mic setup for these exhaust comparisons.

Originally Posted by BrianShaw23

Just had my JCR silenced valved exhaust installed on my Cayman GTS 4.0. I've only driven it maybe 50 miles since installation but already I'm having second thoughts as the drone is noticeably worse than stock and it's creating really annoying resonances inside the cabin. Is this normal for this exhaust? I was expecting it to be similar to stock especially with the valves closed, everything else on the car is completely stock.

Does the JCR exhaust need time to "break in"? At this point regretting not going Kline.

Originally Posted by dmboone25

I think the Cayman / GT4 is more susceptible to drone, as compared to the Boxster / Spyder, especially with the top down on the latter two.

If I remember correctly, the JCR produces "bassiness" in the 2000 - 2700 RPM range, but can be avoided by dropping down a gear. Generally speaking, I think that's the case, more or less, with all of the aftermarket options.

Did you change anything with respect to valve control? If you didn't change the stock GPFs, then the volume should be pretty similar to stock as well.

Originally Posted by BrianShaw23

Yeah completely stock. Even in "valves closed" there's not much of a difference. Going to sell the JCR exhaust and just go Kline, from what I hear very little difference as far as drone compared to stock.

Originally Posted by BrianShaw23

The more I drive the car with the JCR exhaust I'm actually starting to really like it. The drone isn't as bad as it seemed originally. Seems overall the drone is definitely slightly more than stock and much worse than stock at certain RPMs as others have said many times on here. Certain RPMs just have unacceptable levels of drone but for the most part expect slightly more overall drone than stock. The car really does sound amazing though at WOT.

Originally Posted by IL_Pete

Yes, I am okay with it with the top down. Top up in a Boxster is not that much different than top down. (Top up in a Cayman with windows up is much more sensitive, from my experience last year. You have to crack a window or two to reduce that.)

I definitely did notice a slight increase in bassiness with the Soul Resonated OAPs versus the CG HFF OAPs, but my memory tells me not as much so as the Soul Wide Open OAPs (but tough to be certain as (1) that was last year and (2) that was in a Cayman re Stock and Wide Open and now I am comparing in a Boxster), so the Resonated design seems to be making a difference, unless the Placebo effect is getting me - that I am assuming there is a difference so I am hearing it. I find that to make sense, as the CG has a filter in the OAP, albeit a higher flowing one than the Stock OAP with he OPF, which intuitively would be less free flowing than an OAP without a filter with a resonator. So theoretically this is the comparison in flow between the 4 OAPs options I have tried, from lowest to highest flow:

Stock OAPs with OPF >> CG OAPs with HFF >> Resonated OAPs >> Wide Open OAPs

You end up with a spectrum of increased power and volume across that spectrum from left to right, paired with increase in bassiness in the troubled RPM ranges - when combined with an aftermarket more free flowing exhaust. I think it is really that simple. (The Kline not included in that, as it somehow greatly reduces the bassiness with its unique design.) (Also, this does not include any notion aftermarket headers, which I have zero experience with.) To me, the sweet spot of the balance between the tradeoffs is the middle two.

I am finding that with the Soul Resonated OAPs I am turning the VC off from Valves open all the time to letting PSE do its work - when driving casually around town, to reduce that bassiness, as I did with the Cayman last year with the CG HFF OAPs as I just mentioned above, and having Valves open all the time just for the spirited country road drives, versus with the CG HFF OAPs in the Boxster I was leaving them open all the time.

Also of note - there is the bassiness in the 2000 to 2400 RPM range, but there is also a little bit of an increase in the bassiness in the 3500 to 3900 RPM as well, not as significant as the lower one. I do hear it though. I have heard this in other combinations as well, even very slightly in the Kline.

Speaking of the Kline - I am going to try that again, in Inconel like last year. I am curious to try it in the Boxster versus the Cayman, and also with the BMC Air Filters, and compare again with @tdlondon 's Spyder with the Inconel Kline system. I ordered that yesterday - of course from Eric at @SupremePower, who does a great job of keeping those in stock. I am going to do the SS Tips with the Black Finish.

Report on that coming in a few weeks, need to get the tips painted and then get it installed.

Originally Posted by enduro

To be clear, mine sounded incredible outside of the drone zone, even before the headers. I run airpods when I'm on long drives and want to run at relaxed RPM.